water in air duct in 2002 civic?

I just found water {clear, fresh h2o) sloshing around the air duct under
the dash. when you make a left turn, the water goes over to the right and
hits the blower. any idea where it comes from or how to stop it?

 

It's condensation from the air conditioner. There is a drain hose that
comes out of the bottom of that box, goes through the firewall and drains
onto the road. It is clogged. Sometimes you can clear it by shoving a bent
coat hanger up through it to move the debris out of the way. If you pull it
off inside the car, make sure you have something under it to catch the water
and debris that will pour out when you clear it.

 

thanks for the info, i'll give it a try. it is very humid here. other than
this, the car has been great.